基于曲线坐标系浸没边界方法的折流燃烧室模拟

Simulation of Slinger Combustor Based on Curvilinear Coordinate System Immersed Boundary Method

关键词:  数值模拟  浸没边界方法  大涡模拟  概率密度函数输运方程  湍流燃烧模型  折流燃烧室

Key words:  Numerical simulation  Immersed boundary method（IBM）  Large-eddy simulation（LES）  Transported probability density function  Turbulent combustion model  Slinger combustor

摘要:

航空发动机折流燃烧室几何结构复杂，其高保真数值模拟需要高效的网格与边界条件处理方法。采用曲线坐标系隐式浸没边界方法结合大涡模拟-概率密度函数输运方程湍流燃烧模型开发自研软件，并实现WP11中折流燃烧室的高保真模拟。流动模拟中准确解析了该燃烧室中的三股主要气流，且三股气流分别约占进口流量的75%,12.5%和12.5%。两相燃烧模拟中针对拉格朗日框架下的液滴运动和欧拉框架下的湍流燃烧采用不同网格标记，模拟得到的出口径向温度分布规律与实验一致，平均相对误差为17.95%，表明基于本方法开发的自研软件能准确模拟折流燃烧室中的两相湍流燃烧现象。

Abstract:

The high-fidelity numerical simulation of the complex geometry of an aero-engine slinger combustor requires efficient meshing and boundary condition processing methods. We use the implicitly immersed boundary method in curvilinear coordinate system combined with large-eddy simulation and transported probability density function turbulent combustion model to develop the self-developed software and realize the high fidelity simulation of the slinger combustor in WP11. The three main flows in the combustor are accurately resolved in the flow simulation， and the three flows account for about 75%， 12.5% and 12.5% of the inlet flow， respectively. The two-phase combustion simulation uses different grid labels for droplet motion in the Lagrangian frame and turbulent combustion in the Eulerian frame， and the simulated outlet radial temperature distribution pattern is consistent with the experiment with an average relative error of 17.95%， indicating that the self-developed software based on this method can accurately simulate the two-phase turbulent combustion phenomenon in the slinger combustor.